Is there built in method to get all __annotations__ from all base classes in Python?

user_6099211 0
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We have builtin dir() function to get all attributes available for class or instance, defined in based classes.

Is there same for annotations? I'd like to have get_annotations() function, which works like this:

def get_annotations(cls: type): ...  # ?


class Base1:
    foo: float


class Base2:
    bar: int


class A(Base1, Base2):
    baz: str


assert get_annotations(A) == {'foo': float, 'bar': int, 'baz': str}
annotations python types
1 Answers

This should do the trick, right?

def get_annotations(cls: type):
    all_ann = [c.__annotations__ for c in cls.mro()[:-1]]
    all_ann_dict = dict()
    for aa in all_ann[::-1]:
        all_ann_dict.update(**aa) 
return all_ann_dict

get_annotations(A)
# {'bar': int, 'foo': float, 'baz': str}

Or a one-liner version of it:

get_annotations = lambda cls: {k:v for c in A.mro()[:-1][::-1] for k,v in c.__annotations__.items()}

get_annotations(A)
# {'bar': int, 'foo': float, 'baz': str}
user_41269760
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